The Mass-Loss Return from Asymptotic Giant Branch Stars to the Large Magellanic Cloud Using Data from the SAGE Survey

Details The Mass-Loss Return from Asymptotic Giant Branch Stars to the Large Magellanic Cloud Using Data from the SAGE Survey The Mass-Loss Return from Asymptotic Giant Branch Stars to the Large Magellanic Cloud Using Data from the SAGE Survey

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21530102s&link_type=abstract

American Astronomical Society, AAS Meeting #215, #301.02; Bulletin of the American Astronomical Society, Vol. 42, p.297

Astronomy and Astrophysics

Astronomy

Scientific paper

The AGB phase is the penultimate stage of evolution for low- and intermediate-mass stars. AGB stars are responsible for massive dust and gas outflows at rates exceeding their nuclear burning rate, thereby injecting a significant fraction of their mass into the surrounding interstellar medium (ISM), seeding newly-forming stars. The study of AGB mass loss is therefore essential for understanding the chemical evolution of galaxies as a whole. The Large Magellanic Cloud (LMC) is an excellent candidate for such studies. Data from the Spitzer SAGE survey provides us with multi-band photometry of about 30,000 AGB candidates. A rough estimate for the total GB injection rate, obtained from studying the infrared excesses of these stars, is (6-13)x10-3 Msun/yr, the majority of which is due to the so-called "extreme" AGB stars. I present a grid of models for carbon-rich asymptotic giant branch (AGB) stars generated by the radiative transfer (RT) code 2DUST. These models span a range of different effective temperatures and gravities as well as dust shell radii and optical depths. I obtain a baseline set of dust properties for use in the model grid from RT modeling of a single carbon star, data for which was acquired as part of the spectroscopic follow-up to SAGE. The model grid enables, for example, a more precise determination of the AGB injection rate. AGB stars are the best laboratories for the study of dust grains, and the development of a model grid is a huge step towards understanding the role of AGB stars in galaxies.
The SAGE Project is supported by NASA/Spitzer grant 1275598 and NASA NAG5-12595.

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